Some TV manufacturers only support Dolby Digital, while others only support two-channel stereo, defeating the point. Support for all relevant audio codecs isn’t compulsory, so you can’t simply assume that a TV will be able to send a 5.1 Dolby Digital or DTS soundtrack from a movie over ARC. The biggest problem for ARC in its current guise is manufacturers have been left to pick and choose which elements of the protocol they want to include. This means some ARC-enabled products will play together nicely, others might not. Worried about potential lip-sync problems? HDMI v1.3, launched in 2006, added automatic audio syncing, although it was only optional.
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